holtxdoc – Documentation macros for oberdiek bundle, etc

Th­ese are per­sonal macros, which are not nec­es­sar­ily use­ful to
other au­thors (they are pro­vided as part off the source of oth­ers
of the au­thor's pack­ages). Macros that may be of use to other
au­thors are avail­able sep­a­rately, in pack­age
hyp­doc.